Steel Plate Shear Walls with Gravity Load: Theory and Design

 Steel Plate Shear Walls with Gravity Load

Steel Plate Shear Walls with Gravity Load: Theory and Design

Because of its excellent shear strength and stiffness, a properly designed Steel Plate Shear Wall (SPSW) will have considerable energy dissipation capacity, ductility, initial stiffness and ultimate strength. Furthermore, the steel walls are efficient in terms of cost and space due to their light weight, ease of construction and small footprint, and it has been extensively studied and used in a significant number of buildings in the past several decades.

Previous SPSWs used stiffened or thick walls to prevent local buckling. In 1983, Thorburn et al. found out that unstiffened steel wall has a high ductility and strength even after buckling, and they proposed a strip model for estimating the shear strength of the walls.

Their model has a high impact on the study of the SPSWs. In the strip model, the infill plate is divided into several strips to represent the tension field that develops as a result of applied horizontal load. The strips are cumulatively equal in area to the infill plate, inclined at an angle α and pin connected to the boundary members. The angle of inclination is determined based on the theory of least energy.

The shear capacity of the infill plate is determined by the horizontal component of the yield capacity of the tension strips. Thereafter, the unstiffened SPSWs were examined by many researchers through large-scale tests, tests on construction details and analysis of design procedures.

However, a thin rectangular steel wall in a SPSW structure always Simultaneously sustains the lateral load and the gravity load. The gravity load can affect the shear strength of a SPSW. This effect is not considered in most of the research and standards, which will overestimate the shear capacity and may lead to potential danger in practice.

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